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| Home > Publications database > Ablagerung und Bindung von Luftverunreinigungen an Vegetation und anderen atmosphärischen Grenzflächen |
| Book/Report | FZJ-2018-02440 |
1984
Kernforschungsanlage Jülich, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/18069
Report No.: Juel-1949
Abstract: In the present study the questions of the deposition of aerosols and gases are applied to biological and ecological problems concerningthe filtering aspect of atmospheric interfaces, especially vegetation, with respect to air pollution, and also the resulting pollutant effect. In order to determine the deposition of aerosols, the author has carried out numerous field experiments in which the required, polydisperse and monodisperse test aerosols (diameter from 0.4 $\mu$m to 17 $\mu$m) were produced by a two-fluid nozzle generator and a Berglund-Liu generator. The deposition of gases was treated on the basis of current data from the literature. The experiments indicate that the deposition of aerosols on grass largely depends on aerosol diameter, dry weight per unit area and the wind velocityor turbulence of the air layer near the ground. Of the interfaces studied, namely soil without vegetation, water, filter paper, smooth and structured metals, grass, clover and trees, the latter had the greatest dust collecting capability. Computations indicate that dust concentrations with aerosol diameters of 10 $\mu$m transported for 5 km over the Aachen municipal forest (distribution of tree species representative of a forest in the Federal Republic of Germany) an average decrease of 96 % must be expected, whereas under the same conditions mean fallout losses over grass, arable land without vegetation and water of merely 18 %, 7 % and 4 % respectively are to be expected. It is recommended that in the afforestation of areas in the close proximity of industrial regions the common beech, silver birch and Japanese larch should be taken into particular consideration due tho their great deposition effectiveness with respect to dusts and their comparatively high resistance to pollutant gases. Among the tree species investigated, the silver birch and moreover the red horse chestnut, for which environmental conditions are relatively favourable here, should be considered for filtering the air in urban regions because of the high aerosol deposition.
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